Hello
I am an expert when it comes to ecommerce, doing product sourcing and research very well as well as inventory management, order processing and listing of products on e-commerce platforms like amazon, ebay, shopify, magento, aliexpress and the rest. And I have done this for more than 8 years
I think that the files you sent won't work, may I suggest that you first manually add product to your EKM store and from there export so we can use the file. That is the file that will work
Then for amazon , we can use the file, regarding those items that does not have upc, we can list them as private label or list under existing ASIN, if the product is already existing on the amazon catalog.
I will like us discuss further on how to set up our plan of action to get started with a long-term business relationship.
Looking forward to your quick positive response.
Best Regards
Mike